1. State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical Technology Beijing 100029 China
2. DWI ‐ Leibniz‐Institut für Interaktive Materialien e.V. Forckenbeckstr. 50 Aachen D‐52056 Germany
3. Key Laboratory of Advanced Technologies of MaterialsMinistry of EducationSouthwest Jiaotong University Chengdu 610031 China